Abstract
IF steel with two grain sizes ( 70£gm and 210£gm ) strain amplitude of 2%¡B1.6%¡B1%¡B0.8%¡B0.6%¡B0.4%¡B0.3%¡B0.2%¡B0.1%¡B0.05% were fatigued in order to obtain basic fatigue properties. By use TEM , we can know that we can observe dislocation cells from £G£`t = 0.05% ~£G£`t = 2% . When £G£`t > 1.6% , hardening will occur , if not , softening will be observed . The more strain amplitude is , the more plastic deformation will be observed . When£G£`t > 0.3% , the elastic deformation will smaller than plastic deformation . When£G£`t =0.2% ~£G£`t = 0.4% , we can observe secondary hardening from the specimen of 70£gm . When £G£`t > 1% , the n¡¦ of 70£gm is more than the n¡¦ of 210£gm , that means the specimen of 70£gm has bigger hardening . By the ¡¥ Stress amplitude v.s. Plastic deformation amplitude ¡¦ plot of 70£gm and 210£gm , we can know that there is no ¡¥ pleatue ¡¦ . The more strain amplitude is , the more difference between long axis and short axis of dislocation cell will occur .
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0730103-141227 |
| Date | 30 July 2003 |
| Creators | LO, WEN-CHUN |
| Contributors | none, none, none |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0730103-141227 |
| Rights | campus_withheld, Copyright information available at source archive |
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